23mm x 36" (4:1) Black Plastic Coil

36'' Plastic Coil gives you the flexibility to bind documents of any length with minimal waste. This coil is black in colour and 23mm in diameter, which binds up to 170 sheets of 20lb bond paper. 4:1 pitch refers to how many holes there are (4) per (1) inch and this is the most popular pitch for Plastic Coil as it makes inserting the coil easier.